Skip to Content Skip to Search

Encapsulates the notion of a MIME type. Can be used at render time, for example, with:

class PostsController < ActionController::Base
  def show
    @post = Post.find(params[:id])

    respond_to do |format|
      format.html
      format.ics { render body: @post.to_ics, mime_type: Mime::Type.lookup("text/calendar")  }
      format.xml { render xml: @post }
    end
  end
end
Namespace
Methods
#
A
E
H
L
M
N
P
R
T
U

Constants

MIME_NAME = "[a-zA-Z0-9][a-zA-Z0-9#{Regexp.escape('!#$&-^_.+')}]{0,126}"
 
MIME_PARAMETER = "\s*\;\s*#{MIME_PARAMETER_KEY}(?:\=#{MIME_PARAMETER_VALUE})?"
 
MIME_PARAMETER_KEY = "[a-zA-Z0-9][a-zA-Z0-9#{Regexp.escape('!#$&-^_.+')}]{0,126}"
 
MIME_PARAMETER_VALUE = "#{Regexp.escape('"')}?[a-zA-Z0-9][a-zA-Z0-9#{Regexp.escape('!#$&-^_.+')}]{0,126}#{Regexp.escape('"')}?"
 
MIME_REGEXP = /\A(?:\*\/\*|#{MIME_NAME}\/(?:\*|#{MIME_NAME})(?>\s*#{MIME_PARAMETER}\s*)*)\z/
 
PARAMETER_SEPARATOR_REGEXP = /;\s*\w+="?\w+"?/
 
TRAILING_STAR_REGEXP = /^(text|application)\/\*/
 

Attributes

[R] hash
[R] string
[R] symbol
[R] synonyms

Class Public methods

lookup(string)

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 145
def lookup(string)
  LOOKUP[string] || Type.new(string)
end

lookup_by_extension(extension)

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 149
def lookup_by_extension(extension)
  EXTENSION_LOOKUP[extension.to_s]
end

new(string, symbol = nil, synonyms = [])

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 236
def initialize(string, symbol = nil, synonyms = [])
  unless MIME_REGEXP.match?(string)
    raise InvalidMimeType, "#{string.inspect} is not a valid MIME type"
  end
  @symbol, @synonyms = symbol, synonyms
  @string = string
  @hash = [@string, @synonyms, @symbol].hash
end

parse(accept_header)

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 173
def parse(accept_header)
  if !accept_header.include?(",")
    accept_header = accept_header.split(PARAMETER_SEPARATOR_REGEXP).first
    return [] unless accept_header
    parse_trailing_star(accept_header) || [Mime::Type.lookup(accept_header)].compact
  else
    list, index = [], 0
    accept_header.split(",").each do |header|
      params, q = header.split(PARAMETER_SEPARATOR_REGEXP)

      next unless params
      params.strip!
      next if params.empty?

      params = parse_trailing_star(params) || [params]

      params.each do |m|
        list << AcceptItem.new(index, m.to_s, q)
        index += 1
      end
    end
    AcceptList.sort! list
  end
end

parse_data_with_trailing_star(type)

For an input of 'text', returns [Mime[:json], Mime[:xml], Mime[:ics], Mime[:html], Mime[:css], Mime[:csv], Mime[:js], Mime[:yaml], Mime[:text].

For an input of 'application', returns [Mime[:html], Mime[:js], Mime[:xml], Mime[:yaml], Mime[:atom], Mime[:json], Mime[:rss], Mime[:url_encoded_form].

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 207
def parse_data_with_trailing_star(type)
  Mime::SET.select { |m| m.match?(type) }
end

parse_trailing_star(accept_header)

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 198
def parse_trailing_star(accept_header)
  parse_data_with_trailing_star($1) if accept_header =~ TRAILING_STAR_REGEXP
end

register(string, symbol, mime_type_synonyms = [], extension_synonyms = [], skip_lookup = false)

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 159
def register(string, symbol, mime_type_synonyms = [], extension_synonyms = [], skip_lookup = false)
  new_mime = Type.new(string, symbol, mime_type_synonyms)

  SET << new_mime

  ([string] + mime_type_synonyms).each { |str| LOOKUP[str] = new_mime } unless skip_lookup
  ([symbol] + extension_synonyms).each { |ext| EXTENSION_LOOKUP[ext.to_s] = new_mime }

  @register_callbacks.each do |callback|
    callback.call(new_mime)
  end
  new_mime
end

register_alias(string, symbol, extension_synonyms = [])

Registers an alias that's not used on MIME type lookup, but can be referenced directly. Especially useful for rendering different HTML versions depending on the user agent, like an iPhone.

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 155
def register_alias(string, symbol, extension_synonyms = [])
  register(string, symbol, [], extension_synonyms, true)
end

register_callback(&block)

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 141
def register_callback(&block)
  @register_callbacks << block
end

unregister(symbol)

This method is opposite of register method.

To unregister a MIME type:

Mime::Type.unregister(:mobile)
# File actionpack/lib/action_dispatch/http/mime_type.rb, line 216
def unregister(symbol)
  symbol = symbol.downcase
  if mime = Mime[symbol]
    SET.delete_if { |v| v.eql?(mime) }
    LOOKUP.delete_if { |_, v| v.eql?(mime) }
    EXTENSION_LOOKUP.delete_if { |_, v| v.eql?(mime) }
  end
end

Instance Public methods

==(mime_type)

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 269
def ==(mime_type)
  return false unless mime_type
  (@synonyms + [ self ]).any? do |synonym|
    synonym.to_s == mime_type.to_s || synonym.to_sym == mime_type.to_sym
  end
end

===(list)

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 261
def ===(list)
  if list.is_a?(Array)
    (@synonyms + [ self ]).any? { |synonym| list.include?(synonym) }
  else
    super
  end
end

=~(mime_type)

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 283
def =~(mime_type)
  return false unless mime_type
  regexp = Regexp.new(Regexp.quote(mime_type.to_s))
  @synonyms.any? { |synonym| synonym.to_s =~ regexp } || @string =~ regexp
end

all?()

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 299
def all?; false; end

eql?(other)

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 276
def eql?(other)
  super || (self.class == other.class &&
            @string    == other.string &&
            @synonyms  == other.synonyms &&
            @symbol    == other.symbol)
end

html?()

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 295
def html?
  (symbol == :html) || /html/.match?(@string)
end

match?(mime_type)

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 289
def match?(mime_type)
  return false unless mime_type
  regexp = Regexp.new(Regexp.quote(mime_type.to_s))
  @synonyms.any? { |synonym| synonym.to_s.match?(regexp) } || @string.match?(regexp)
end

ref()

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 257
def ref
  symbol || to_s
end

to_s()

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 245
def to_s
  @string
end

to_str()

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 249
def to_str
  to_s
end

to_sym()

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 253
def to_sym
  @symbol
end